Hydraulic jack



x (No Model.)

` 2 sheetsY-neet 1. D. DRAWBAUGH.

HYDRAULIC JACK.

MNo. 288,697. Patented Nov. 20, 1883.

WML

Flin'ill (No Model.) 2 Sheets-Sheet 2:

D. DRAWBAUGH.

HYDRAULIC JACK.

' Patented Nov. 20, 1883.

KlIlI-lllllllllllll valves N and` N `shown in Figs. 3 and 4.V

UNrriD STATES :PATENT OFFICE.

DANIEL DRAWBAUGH, OF EBERLYS MILL, ASSIGNOR OF ONE-HALF TO EDGAR W.CHELLIS, OF HARRISBURG, PENNSYLVANIA.

HYDRAULIC JACK.

SPECIFICATION forming part` of Letters Patent No. 288,697, datedNovember i0, 1883.

To aIZZ whom it may concern:

Be it known that I, DANIEL DRAWBAUGH, of Eberlys Mill, Cumberlandcounty, Pennsylvania, have invented new and useful Improvements inHydraulic Jacks, of which the following is afull, clear, and exactdescription and specification.

The objects of my improvements are, rst, the construction of cheaper,lighter, and stronger hydraulic jacks, and economy of space in the same;second, the construction of hydraulic jacks in such manner that partsthereof may be removed when injured and other parts substituted thereforcheaply and quickly; third, that by substitution of cheap parts (whilethe more expensive parts are retained) hydraulic jacks may be lengthenedor shortened, and thus adapted to different kinds of work; fourth,providing better pump mechanism; fth, providingbetter packing for suchparts of hydraulic jacks as require the same. These objects I attain bymeans of the mechanism illustrated in the accompanying drawings, inwhich Figure 1 represents a side, and Fig. 2 a front, elevation of myimproved jack, the pump-handle being shown partly broken away. Fig.Srepresents avertical section yof thesame through line y y in Fig. 2.Fig. 4 represents a vertical section of jack-pump through linem @cofFig. l. Figs. and 6 represent the pump- Figs. 7 and 8 represent thepacking-rings d* of pump-piston shown in Figs. 3 and 4. Fig. 9represents a horizontal section through the `plunger and its casing andthe pump and its auxiliary valve-chamber, the line @fg/passing throughthe plunger andits casing and the pump, the line m x passing throughthepump and its auxiliary valve-chamber, and the line e z passing throughthe plunger and casing and the valve-chamber auxiliary tothe pump. Fig.10 is a vertical section of the plungerspace in central casting and theauxiliary valve chamber; showing the duct through which the liquidpasses from the latter to the former. y

Upon a base-plate, A2, is secured in any suitable manner atubular casingcomposed of two parts, A and A, held togetherby central y Applicationled June 2l, 1892. (No model.)

casting, B, of size and form suitable for the purposes hereinafterdescribed.

Tubular casing A is provided with a cap, a, perforated to allow the freevertical motion of plunger C. Into the perforation in said cap a isinserted a plunger, G, extending, when in a state of rest in its lowestposition previous to exerting lifting force, down through casting B intolower tube, A', and provided at its top with a cap, c. Said plungerconsists of a tube, and has inserted in it and securely fastened to itssides at any point at or near its center, but preferably at its center,a plug, C3, which forms an abutment to prevent the passage of liquidfrom one part of the plunger to the other, and also the surface uponwhich is `'exerted the lifting-power of the liquid compressed in thespace beneath. The lower end of the plunger is left open, in orderfreely to admit the compressed liquid and allow it to exert its liftingforce upon plug G3. For the same purpose any number of perforations maybe made in the periphery of the plunger near `its lower end. Immediatelyabove plug C3 is vwith the center of casing-tubes A and A', a

box of size suitable to admit and at the same time snugly confineplunger C, packing t being provided to prevent the escape of liquid fromspace A7 to space A.

The upper and lower parts of the casing are joined to the centralcasting by means of screwthreads, or in such other suitable manner as torender them easily separable. Through the base-plate is a perforationprovided with a screw-plug, A4, for filling spaces A7 and c with liquidprevious to working the jack. Caps a and care provided with packing aand c to prevent lthe escape of the liquid.

The pump D consists of la chamber, did,

a do

(the former or lower part being situated in hollow screw-plug d', andthe latter or upper part in -the body of extension D of central casting,13,) valve N in hollow'screw-plug d', piston E', snugly confined bypacking-rings d3 d4, and auxiliary valve-chamber B', with its valve N.

The piston E is operated by connecting-rods or bridle E and pump-handleF, working by means of its segment-gear Fl in rack F', said handle andconnecting -rods being held together and in place by screws f, the innerends of which slide in recesses bi. rlhe piston-packing is composed ofalternate rings of metal and leather, or other flexible and elasticmaterial, the internal diameter of the metal rings d3 being less thanthe internal diameter of rings d4. This packing is held in place byscrew-plug d.

G is a cock for opening and closing channel g, through which the liquidflows from the lower to the upper parts of the jack when the plunger ispressed down.

The operation of the jack is as follows: The upper and lower parts beingfilled with liquid by the removal of cap c and plug A4, and the plungerbeing at its lowest point, as shown in Fig. 3, upon raising piston E'the liquid is drawn from space fcl through vent c", and from space A6through channel and, raising pump-valve N, flows into and fills chamberd5 dg. Thence, on the return-stroke ofthe piston, it is forced throughchannel n into auxiliary chamber containing valve N', and thence, byduct or channel m and space A7,' into space c3 in the lower part of theplunger, where it exerts its lifting force upon plug or abutment C, andthereby raises the plunger.

1. In a hydraulic jack, the combination,with the tubular casing, of thetubular plunger having the transverse abutment, a communicating channelbetween the upper and lower chambers of the plunger, and a pump andvalves for withdrawing the liquid from the upper chamber of the plungerand forcing it into the lower chamber thereof, so as to exert liftingforce upon the abutment to raise the plunger,

' substantially as described.

port through which communication is permitted to the upper space betweentheY plunger and casing, while the lower chamber of the plunger opensinto the lower space between the plunger and casing, the channel leadingfrom'the upper space between plunger and casing to the lower spacebetween plunger and casing, and the pump and valves for withdrawing theliquid from the upper chamber of the plunger and the upper space andforcing it into the lower space and the lower chamber of the plunger, soas to raise the plunger, substantially as described.

3. In a hydraulic jack, the combination of the tubular casing, theplunger having the upper and lower ,chambers and intermediate abutment,and fitted within the tubular casing,

so as to leave an upper and lower space, as

described, the passage communicating the upper space with the lowerspace, and the pump and valves for forcing the liquid through saidchannel, and a supplemental channel connecting the upper and lower`vspace, and provided with a valve,which,when opened, permits the Y ingdetachably connected to said central casting, the detachable base andvthe tubular plunger, the whole arranged substantially as described.

5. The combination,with the casting B, having the channels m n o, of thedetachable screwplug d', having the recess in its end constituting aportion of the vpump-chamber, the Valves N and N', and the pump-piston,operated substantially as described.

6. The combinatiomwith the casting B, of the pump-pistonfthe yoke E, theoperating handle F, having the cogged inner ends, the racks F on thecasting, and the bolt-and-slot connection between the yoke and thepump-handle, l

substantially as described.

DANIEL DRAWBAUGH. Witnesses:

M. W. JAcoBs, GEORGE W. Hniens.

IOO

